Specific heat (or heat capacity)(C) is the amount of heat required to change the temperature of a mass unit of a substance by one degree.

Isobaric heat capacity(Cp) is used for substances in a constant pressure (ΔP = 0) system.

Isochoric heat capacity (Cv) is used for substances in a constant-volume, (= isovolumetric or isometric) closed system.

The specific heat - CP and CV - will vary with temperature. When calculating mass and volume flow of a substance in heated or cooled systems with high accuracy - the specific heat (= heat capacity) should be corrected according values in the figures and the table below.

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